The PN and Class designations we commonly use are both methods of expressing pressure; the difference lies in the reference temperatures at which the pressures they represent apply. The European PN system refers to the p...

When testing newly installed piping systems, the pipes and valves must first undergo preliminary testing: two leakage tests, a 150% hydrostatic test and an N₂He (nitrogen and helium) leakage test. These tests cover not ...

What is the difference between a vent valve chamber and a sludge valve chamber? I. Their purposes differ1. Purpose of a vent valve chamber: To facilitate the opening and closing of valves on underground pipelines and con...

The corrosion resistance of stainless steel generally increases with higher chromium content. The basic principle is that when there is sufficient chromium in the steel, a very thin, dense oxide film forms on the surface...

Once winter sets in, temperatures drop rapidly and valves often freeze. If left unaddressed, this can easily lead to pipe failures. In high-risk operating conditions, it may even result in accidents. Therefore, frost pro...

1. Leakage at the connection between gate valvesFirstly, check whether the connecting bolts between the gate valves are tightened. If they are not tightened, the sealing gasket ring inside will not make full contact with...

Pressure-bearing valves in the surface facilities and equipment of the Daqing Oilfield have developed internal leaks due to wear, corrosion or other causes. As internal leaks are difficult to detect, some faulty valves h...

A pneumatic control valve uses compressed air as its power source and a pneumatic cylinder as its actuator. With the aid of accessories such as electric valve positioners, converters, solenoid valves and hold-open valves...

Pressure-reducing valves are widely used in fire water supply and automatic sprinkler systems. Today, we will explore the working principle of pressure-reducing valves and their installation requirements. I. Working Prin...

The valve market today is a mixed bag, with unscrupulous traders passing off counterfeit and refurbished valves as genuine products in order to make exorbitant profits, thereby posing significant safety risks to installa...

Metal valves have been widely used across many industries for centuries. However, due to material limitations, their structures and materials have been improved to meet increasingly demanding operating conditions. On the...

The manufacturing sector forms the foundation of the economic structure. The real economy, centred on manufacturing, is the cornerstone of the nation’s economic development. However, since the global financial crisis, th...